HSS Insider – Jun 2023 – Hidden Toe Weld

June 2023 | Issue #19

To Weld or Not to Weld the Hidden Toe

STI recently sponsored research regarding the hidden toe in overlapped rectangular HSS K-connections. This article by Dr. Jeffrey A. Packer summarizes the research, discussing conditions where the hidden toe can be left unwelded without compromising the connection strength and allow for greater flexibility in fabrication of an overlapped K-connection.

Design Example: HSS Overlapped K-Connections With and Without the Hidden Toe Weld

A recent study has proven that the hidden toe of the overlapped HSS branch in rectangular K-connections does not need to be welded to achieve proper connection capacity. Step through an example demonstrating the process for designing an overlapped K-connection without the hidden toe weld.

Upcoming FREE Webinar

Through-Bolts and Blind Bolts to HSS

Explore bolting techniques for connecting to HSS members in this free webinar! Gain insights into HSS limit states, deep dive into through-bolting and one-sided bolt options through design examples, and learn about proprietary bolts for efficient and accessible connections.  Don’t miss this opportunity on June 28th.  Attendees can earn 1.0 PDH and receive a certificate upon completion.

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Related Resources

 A Guide to Computer Modeling HSS Trusses

In this article, Dr. Jeffrey Packer evaluates various truss analysis models against large scale truss tests, providing practical insights for accurate member axial force prediction, chord member moment consideration, and reliable deflection estimation.

Material Selection Tips for Optimizing HSS-to-HSS Connections

It seems counterintuitive but it’s true: Minimum truss weight does not necessarily reduce cost because thinner walls can lead to the need for stiffeners or reinforcing. Learn how to achieve efficient and economical connections when sizing branch and chord members for HSS truss K-, Y- and X-connections. 

Designing HSS KT-Connections With Confidence

Explore the intricate design complexities of HSS KT-connections in this comprehensive article. Gain valuable insights into the analysis methods for gapped and overlapped KT-connections, while uncovering practical strategies for optimizing the performance of HSS Warren trusses.

Green Fact

Water Consumption is Minimal in Steel Production

“Water consumption and discharge is minimal at mill facilities. While several thousand gallons of water are used to quench the molten steel sections (quenching not only cools the steel, it increases the strength of the steel) less than 70 gallons of water [per ton of steel] are actually consumed. The remaining water is recycled in a closed loop recycling process and reused in the process.” Source: AISC “More than Recycled Content”

In The News

Atlas Tube Expands Shuriken™ Structural Nut Keeper Offering

The Shuriken™ Structural Nut Keeper makes field-bolted HSS column splices and other connections possible, which lowers costs and saves time. This product is now available in a new 1-inch size, expanding the possibilities for structural engineers and others who work with HSS.

AISC 360-2022 Now Available

Download a free PDF of the new AISC 360-2022 Specification for Structural Steel Buildings to get the latest on HSS member and connection design specification provisions.